EP0307535B1 - Method for continuous embossing the surface of a cold prefabricated thermoplastic sheet by heat and pressure using an embossing roller - Google Patents

Method for continuous embossing the surface of a cold prefabricated thermoplastic sheet by heat and pressure using an embossing roller Download PDF

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Publication number
EP0307535B1
EP0307535B1 EP88102135A EP88102135A EP0307535B1 EP 0307535 B1 EP0307535 B1 EP 0307535B1 EP 88102135 A EP88102135 A EP 88102135A EP 88102135 A EP88102135 A EP 88102135A EP 0307535 B1 EP0307535 B1 EP 0307535B1
Authority
EP
European Patent Office
Prior art keywords
embossing
thermoplastic sheet
temperature
heat
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88102135A
Other languages
German (de)
French (fr)
Other versions
EP0307535A2 (en
EP0307535A3 (en
Inventor
Hugo Böttcher
Klaus Heimrich
Gustav Hildebrandt
Heinrich Dr. Kracke
Johannes Richter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JH Benecke GmbH
Original Assignee
JH Benecke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JH Benecke GmbH filed Critical JH Benecke GmbH
Publication of EP0307535A2 publication Critical patent/EP0307535A2/en
Publication of EP0307535A3 publication Critical patent/EP0307535A3/en
Application granted granted Critical
Publication of EP0307535B1 publication Critical patent/EP0307535B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0032—Producing rolling bodies, e.g. rollers, wheels, pulleys or pinions
    • B29D99/0035—Producing rolling bodies, e.g. rollers, wheels, pulleys or pinions rollers or cylinders having an axial length of several times the diameter, e.g. for embossing, pressing, or printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/40—Plastics, e.g. foam or rubber
    • B29C33/405—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/02—Dies; Accessories
    • B44B5/026—Dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2883/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as mould material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/001—Flat articles, e.g. films or sheets having irregular or rough surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/32—Wheels, pinions, pulleys, castors or rollers, Rims
    • B29L2031/324—Rollers or cylinders having an axial length of several times the diameter, e.g. embossing, pressing or printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/722—Decorative or ornamental articles

Definitions

  • the invention relates to a method of the type mentioned in the preamble of claim 1.
  • thermoplastic under heat and pressure by means of a stamping roller made of silicone rubber is known from the generic AT-PS 228 476.
  • an embossing roller made of silicone rubber By using an embossing roller made of silicone rubber, a continuous embossing process is possible in itself, but the use of the silicone rubber as an embossing surface, particularly in the case of a high-speed embossing process, leads to difficulties because the embossing time is relatively short and the silicone rubber is relatively soft.
  • the final heating of the film to the embossing temperature takes place slowly, and due to the much better thermal conductivity of the film itself, any differences in heat that occur in the cross section of the film compensate, so that the temperature across the cross section of the film is practically the same when the film Embossing gap reached.
  • the temperature of the air cushion on the side facing away from the stamping side of the film is somewhat lower than that of the air on the stamping side. Due to the better thermal conductivity of the film in relation to the surrounding air, no noticeable temperature differences can form over the cross section of the film. However, this limits the heating of the film to temperatures at which it still has sufficient strength to remain manageable until it enters the nip. Such temperatures do not allow the use of a silicone embossing roller so that it can emboss its finely contoured embossing surface into the surface of the film to be embossed.
  • the invention has for its object to provide a method of the type in question, which makes it possible to carry out the embossing with an embossing roller, the embossing surface of which is made of silicone rubber, in such a way that the embossing process takes place as quickly as possible, the embossing surface remains undamaged and at the same time the embossing with as much as possible high accuracy.
  • thermoplastic film to be embossed that the thermoplastic penetrates even into the finest recesses of the embossing surface of the embossing roller made of silicone rubber and thus the embossing structure is transferred exactly.
  • the embossed thermoplastic film can be removed from the embossing roller, the embossing surface of the embossing roller not being impaired because of the elasticity of the silicone rubber.
  • An embossing roller for the continuous embossing of thermoplastic film by means of a template made of natural leather, textile or the like is produced.
  • This embossing roller is used to emboss a prefabricated thermoplastic film, which consists of a top layer and an underlying layer.
  • the thermoplastic film is heated to a temperature of 180 ° -250 ° C, depending on the material used. At this temperature, the top layer of the thermoplastic film has a high flowability and therefore penetrates into the fine contours of the embossing surface of the embossing roller.
  • the top layer also has a plasticizer made of a High polymer.
  • the lower layer has a lower fluidity at the embossing temperature mentioned. After embossing, the embossed thermoplastic film is cooled and removed from the embossing roller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Moulding By Coating Moulds (AREA)

Description

Die Erfindung betrifft ein Verfahren der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a method of the type mentioned in the preamble of claim 1.

Das kontinuierliche Prägen von thermoplastischem Kunststoff unter Wärme und Druck mittels einer Prägewalze aus Silicongummi ist durch die gattungsgemäße AT-PS 228 476 bekannt. Durch die Verwendung einer Prägewalze aus Silicongummi ist an sich ein kontinuierlicher Prägevorgang möglich, jedoch führt die Verwendung des Silicongummis als Prägeoberfläche, insbesondere bei einem schnellaufenden Prägevorgang, zu Schwierigkeiten, da die Prägezeit verhältnismäßig kurz und das Silicongummi verhältnismäßig weich ist.The continuous stamping of thermoplastic under heat and pressure by means of a stamping roller made of silicone rubber is known from the generic AT-PS 228 476. By using an embossing roller made of silicone rubber, a continuous embossing process is possible in itself, but the use of the silicone rubber as an embossing surface, particularly in the case of a high-speed embossing process, leads to difficulties because the embossing time is relatively short and the silicone rubber is relatively soft.

Durch die DE-OS 21 41 613 ist es bekannt, aus einer Düse austretendes, noch weiches Bandmaterial aus thermoplastischem Kunststoff mittels eines Walzenpaares zu prägen. Die Oberfläche des Bandmaterials hat hierbei jedoch eine Temperatur, die ein Eindringen des Bandmaterials in feine Poren der Prägeoberfläche der Prägewalzen ausschließt, zumal sich die Oberfläche des Bandmaterials nach dem Austritt aus der Düse durch Wärmestrahlung schnell etwas abkühlt, wodurch die Fließfähigkeit verringert wird. Eine exakte Übertragung der von einer natürlichen Vorlage, beispielsweise Naturleder, abgenommenen Prägeoberfläche einer Prägewalze aus Silicongummi ist daher nicht möglich.From DE-OS 21 41 613 it is known to emboss a still soft strip material made of thermoplastic material emerging from a nozzle by means of a pair of rollers. However, the surface of the strip material has a temperature which prevents the strip material from penetrating into fine pores of the embossing surface of the embossing rollers, especially since the surface of the strip material cools down somewhat after it emerges from the nozzle by heat radiation, which reduces the flowability. An exact transfer of the embossing surface of an embossing roller made of silicone rubber, which is removed from a natural template, for example natural leather, is therefore not possible.

Durch US-A-2 928 124 ist ein Verfahren der betreffenden Art bekannt, bei dem die zu prägende Kunststoffolie in einem Vorwärmer vorerwärmt wird, und zwar auf eine Temperatur, die unterhalb der Prägetemperatur liegt. Nach dieser Vorerwärmung erfolgt eine Schlußerwärmung auf die Prägetemperatur in einer langen Kammer, in der die Kunststoffolie über eine lange Wegstrecke frei von einem von unten wirkenden Luftkissen gegen den Druck eines von oben wirkenden Luftkissens getragen ist. Die Luft der Luftkissen hat die zum Prägen erforderliche Temperatur, die sich auf die Folie übertragen soll. Der Wärmeübergang von Luft zu der Folie ist verhältnismäßig schlecht, so daß die Durchlaufstrecke durch den durch eine Kammer gebildeten Schlußerhitzer verhältnismäßig lang ist. Somit erfolgt die endgültige Erwärmung der Folie auf die Prägetemperatur langsam, und aufgrund der viel besseren Wärmeleitfähigkeit der Folie selbst gleichen sich eventuell auftretende Wärmeunterschiede im Querschnitt der Folie aus, so daß die Temperatur quer über dem Querschnitt der Folie praktisch gleich ist, wenn die Folie den Prägespalt erreicht. Dies gilt auch für den Fall, wenn, wie in dieser Schrift angegeben, die Temperatur des Luftkissens auf der der Prägeseite der Folie abgewandten Seite etwas niedriger ist als die der Luft auf der Prägeseite. Aufgrund der besseren Wärmeleitfähigkeit der Folie im Verhältnis zu der angrenzenden Luft können sich keine merklichen Temperaturunterschiede über den Querschnitt der Folie ausbilden. Damit ist aber die Erwärmung der Folie auf Temperaturen begrenzt, bei denen sie noch eine ausreichende Festigkeit hat, um bis zum Einlauf in den Walzenspalt handhabbar zu bleiben. Solche Temperaturen ermöglichen nicht die Verwendung einer Siliconprägewalze, damit diese ihre feinkonturierte Prägeoberfläche in die Oberfläche der zu prägenden Folie einprägen kann.From US-A-2 928 124 a method of the type in question is known, in which the plastic film to be embossed is preheated in a preheater to a temperature which is below the embossing temperature. After this preheating, there is a final heating to the embossing temperature in a long chamber in which the plastic film is carried over a long distance free of an air cushion acting from below against the pressure of an air cushion acting from above. The air of the air cushions has the temperature required for embossing, which should be transferred to the film. The heat transfer from air to the film is relatively poor, so that the passage through the final heater formed by a chamber is relatively long. Thus, the final heating of the film to the embossing temperature takes place slowly, and due to the much better thermal conductivity of the film itself, any differences in heat that occur in the cross section of the film compensate, so that the temperature across the cross section of the film is practically the same when the film Embossing gap reached. This also applies if, as stated in this document, the temperature of the air cushion on the side facing away from the stamping side of the film is somewhat lower than that of the air on the stamping side. Due to the better thermal conductivity of the film in relation to the surrounding air, no noticeable temperature differences can form over the cross section of the film. However, this limits the heating of the film to temperatures at which it still has sufficient strength to remain manageable until it enters the nip. Such temperatures do not allow the use of a silicone embossing roller so that it can emboss its finely contoured embossing surface into the surface of the film to be embossed.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der betreffenden Art anzugeben, das es ermöglicht, die Prägung mit einer Prägewalze durchzuführen, deren Prägeoberfläche aus Silicongummi besteht, derart, daß der Prägevorgang möglichst schnell abläuft, die Prägeoberfläche unbeschädigt bleibt und gleichzeitig die Prägung mit möglichst hoher Exaktheit erfolgt.The invention has for its object to provide a method of the type in question, which makes it possible to carry out the embossing with an embossing roller, the embossing surface of which is made of silicone rubber, in such a way that the embossing process takes place as quickly as possible, the embossing surface remains undamaged and at the same time the embossing with as much as possible high accuracy.

Die der Erfindung zugrundeliegende Aufgabe wird durch die im Kennzeichen des Anspruchs 1 angegebene Lehre gelöst.The object on which the invention is based is achieved by the teaching specified in the characterizing part of claim 1.

Temperaturen der angegebenen Höhe führen zu einer derartigen Erweichung bis hin zu einer Verflüssigung der zu prägenden Oberfläche der thermoplastischen Kunststoffolie, daß der thermoplastische Kunststoff selbst in feinste Vertiefungen der Prägeoberfläche der Prägewalze aus Silicongummi eindringt und somit die Prägestruktur exakt übertragen wird. Nach einer anschließenden Abkühlung kann die geprägte thermoplastische Folie von der Prägewalze abgezogen werden, wobei wegen der Elastizität des Silicongummis die Prägeoberfläche der Prägewalze nicht beeinträchtigt wird.Temperatures of the specified level lead to such softening up to a liquefaction of the surface of the thermoplastic film to be embossed that the thermoplastic penetrates even into the finest recesses of the embossing surface of the embossing roller made of silicone rubber and thus the embossing structure is transferred exactly. After a subsequent cooling, the embossed thermoplastic film can be removed from the embossing roller, the embossing surface of the embossing roller not being impaired because of the elasticity of the silicone rubber.

Vorteilhafte Weiterbildungen der grundlegenden Lehre sind in den Unteransprüchen angegeben. Sie sind in dem nach folgenden Beispiel für die Ausführung des erfindungsgemäßen Verfahrens erläutert.Advantageous further developments of the basic teaching are specified in the subclaims. They are explained in the example below for the implementation of the method according to the invention.

Beispielexample

Es wird eine Prägewalze zum kontinuierlichen Prägen von thermoplastischer Folie mittels einer Vorlage aus natürlichem Leder, Textil oder dergleichen hergestellt. Mit dieser Prägewalze wird eine vorgefertigte thermoplastische Folie geprägt, die aus einer Deckschicht und einer darunterliegenden Unterschicht besteht. Die thermoplastische Folie wird auf eine Temperatur von 180°-250°C, je nach dem verwendeten Material, erwärmt. Bei dieser Temperatur hat die Deckschicht der thermoplastischen Folie eine hohe Fließfähigkeit und dringt daher in die feinen Konturen der Prägeoberfläche der Prägewalze ein. Die Deckschicht weist außerdem einen Weichmacher aus einem Hochpolymer auf. Die Unterschicht hat bei der genannten Prägetemperatur eine geringere Fließfähigkeit. Nach dem Prägen erfolgt eine Kühlung und ein Abziehen der geprägten thermoplastischen Folie von der Prägewalze.An embossing roller for the continuous embossing of thermoplastic film by means of a template made of natural leather, textile or the like is produced. This embossing roller is used to emboss a prefabricated thermoplastic film, which consists of a top layer and an underlying layer. The thermoplastic film is heated to a temperature of 180 ° -250 ° C, depending on the material used. At this temperature, the top layer of the thermoplastic film has a high flowability and therefore penetrates into the fine contours of the embossing surface of the embossing roller. The top layer also has a plasticizer made of a High polymer. The lower layer has a lower fluidity at the embossing temperature mentioned. After embossing, the embossed thermoplastic film is cooled and removed from the embossing roller.

Claims (4)

  1. A process for continuously embossing the surface of a prefabricated thermoplastic sheet by heat and pressure by means of an unheated embossing roller, the surface of which has a negative shape of a grain to be embossed,
    characterised in that an embossing roller is used, which at least in the region of its peripheral surface is made of silicon rubber,
    in that the thermoplastic sheet is heated from the cold state only on the side to be embossed directly to the temperature required for embossing,
    and in that this heating is performed to a temperature of at least 150°C, preferably 180 - 250°C.
  2. A process according to Claim 1,
    characterised in that a thermoplastic sheet is used which made from a plastic comprising a softener which is a high polymer, a rectilinear long-chain alcohol, a softening polymer or a combination of these materials.
  3. A process according to Claim 1,
    characterised in that a thermoplastic sheet is used, which in the region of the surface to be embossed comprises an outer layer, the viscosity of which at the embossing temperature is less than that of a lower layer of the sheet which is underneath it.
  4. A process according to Claim 3,
    characterised in that the outer layer is connected to the lower layer during embossing.
EP88102135A 1983-09-14 1984-08-23 Method for continuous embossing the surface of a cold prefabricated thermoplastic sheet by heat and pressure using an embossing roller Expired - Lifetime EP0307535B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3333179 1983-09-14
DE3333179 1983-09-14
DE3405985 1984-02-20
DE3405985A DE3405985C2 (en) 1983-09-14 1984-02-20 Process for the production of an embossing roller for the continuous embossing of the surface of a thermoplastic film with a grain

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP84110052.2 Division 1984-08-23

Publications (3)

Publication Number Publication Date
EP0307535A2 EP0307535A2 (en) 1989-03-22
EP0307535A3 EP0307535A3 (en) 1989-06-14
EP0307535B1 true EP0307535B1 (en) 1993-10-13

Family

ID=25813987

Family Applications (3)

Application Number Title Priority Date Filing Date
EP88102135A Expired - Lifetime EP0307535B1 (en) 1983-09-14 1984-08-23 Method for continuous embossing the surface of a cold prefabricated thermoplastic sheet by heat and pressure using an embossing roller
EP84110052A Expired EP0144541B1 (en) 1983-09-14 1984-08-23 Method for the production of an engraved roller for continuously embossing the surface of a thermoplastic sheet with veins
EP88102136A Expired - Lifetime EP0300118B1 (en) 1983-09-14 1984-08-23 Method for producing a silicone casting belt for casting plastic sheets provided with a grain, in particular one of natural leather

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP84110052A Expired EP0144541B1 (en) 1983-09-14 1984-08-23 Method for the production of an engraved roller for continuously embossing the surface of a thermoplastic sheet with veins
EP88102136A Expired - Lifetime EP0300118B1 (en) 1983-09-14 1984-08-23 Method for producing a silicone casting belt for casting plastic sheets provided with a grain, in particular one of natural leather

Country Status (7)

Country Link
US (1) US4551297A (en)
EP (3) EP0307535B1 (en)
CA (1) CA1247821A (en)
DE (1) DE3405985C2 (en)
ES (2) ES535830A0 (en)
HK (1) HK1006822A1 (en)
PT (1) PT79038B (en)

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EP0307535A2 (en) 1989-03-22
DE3405985A1 (en) 1985-03-28
EP0300118A3 (en) 1989-09-13
PT79038B (en) 1986-06-03
EP0144541A2 (en) 1985-06-19
DE3405985C2 (en) 1986-01-16
HK1006822A1 (en) 1999-03-19
ES545281A0 (en) 1986-02-01
EP0307535A3 (en) 1989-06-14
ES8605718A1 (en) 1985-12-16
EP0144541A3 (en) 1986-06-25
US4551297A (en) 1985-11-05
CA1247821A (en) 1989-01-03
ES535830A0 (en) 1985-12-16
EP0300118B1 (en) 1991-10-09
ES8605719A1 (en) 1986-02-01
PT79038A (en) 1984-09-01
EP0144541B1 (en) 1989-01-18
EP0300118A2 (en) 1989-01-25

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